FacetOperation (Spring Data MongoDB 4.1.3 API)

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extends Object implements FieldsExposingAggregationOperation

Encapsulates the aggregation framework


    $facet

-operation.
Facet of


     AggregationOperation

s to be used in an


     Aggregation

. Processes multiple


     AggregationOperation

pipelines within a single stage on the same set of input documents. Each sub-pipeline has its own field in the output document where its results are stored as an array of documents.


     FacetOperation

enables various aggregations on the same set of input documents, without needing to retrieve the input documents multiple times.
As of MongoDB 3.4,


     FacetOperation

cannot be used with nested pipelines containing


     GeoNearOperation


     OutOperation

and


     FacetOperation

.
We recommend to use the static factory method


     Aggregation.facet()

instead of creating instances of this class directly.

Since:

Author:

Mark Paluch, Christoph Strobl

Nested classes/interfaces inherited from interface org.springframework.data.mongodb.core.aggregation. FieldsExposingAggregationOperation


   
    FieldsExposingAggregationOperation.InheritsFieldsAggregationOperation

Description


    
     FacetOperation.FacetOperationBuilder


    
     and
    
    
    (
    
     AggregationOperation
    
    ... operations)

Creates a new


     FacetOperation.FacetOperationBuilder

to append a new facet using operations.


    
     ExposedFields


    
     getFields
    
    ()

Returns the fields exposed by the


     AggregationOperation


    
     String


    
     getOperator
    
    ()

Return the MongoDB operator that is used for this


     AggregationOperation


    org.bson.Document


    
     toDocument
    
    
    (
    
     AggregationOperationContext
    
    context)

Turns the


     AggregationOperation

into a


    Document

by using the given


     AggregationOperationContext

Methods inherited from class java.lang. Object


   
    clone
   
   ,
   
    equals
   
   ,
   
    finalize
   
   ,
   
    getClass
   
   ,
   
    hashCode
   
   ,
   
    notify
   
   ,
   
    notifyAll
   
   ,
   
    toString
   
   ,
   
    wait
   
   ,
   
    wait
   
   ,
   
    wait

Methods inherited from interface org.springframework.data.mongodb.core.aggregation. AggregationOperation


   
    toPipelineStages

Methods inherited from interface org.springframework.data.mongodb.core.aggregation. FieldsExposingAggregationOperation


   
    inheritsFields

public FacetOperation.FacetOperationBuilder and ( AggregationOperation ... operations)

Creates a new


     FacetOperation.FacetOperationBuilder

to append a new facet using operations.


     FacetOperation.FacetOperationBuilder

takes a pipeline of


     AggregationOperation

to categorize documents into a single facet.

Parameters:


    operations

- must not be null or empty.

Returns:

toDocument

public org.bson.Document toDocument ( AggregationOperationContext context)

Description copied from interface:


     
      AggregationOperation

Turns the


     AggregationOperation

into a


    Document

by using the given


     AggregationOperationContext

Specified by:


    
     toDocument

in interface


    
     AggregationOperation

Parameters:


    context

- the


     AggregationOperationContext

to operate within. Must not be null.

Returns:

the Document

getOperator

public String getOperator ()

Description copied from interface:


     
      AggregationOperation

Return the MongoDB operator that is used for this


     AggregationOperation

. Aggregation operations should implement this method to avoid document rendering.

Specified by:


    
     getOperator

in interface


    
     AggregationOperation

Returns:

the operator used for this


     AggregationOperation

getFields

public ExposedFields getFields ()

Description copied from interface:


     
      FieldsExposingAggregationOperation

Returns the fields exposed by the


     AggregationOperation

Specified by:


    
     getFields

in interface


    
     FieldsExposingAggregationOperation

Returns:

will never be null.